sqrt, sqrtf
[positive square root]

SYNOPSIS
#include <math.h> 
double sqrt(double x); 
float sqrtf(float x);

DESCRIPTION
sqrt computes the positive square root of the argument. You can modify error handling for this function with matherr.

RETURNS
On success, the square root is returned. If x is real and positive, then the result is positive. If x is real and negative, the global value errno is set to EDOM (domain error).

COMPLIANCE
sqrt is ANSI C. sqrtf is an extension.